Figured I should add this, since the bugs are common enough.

- Certain circumstances may cause G-Man to get stuck at a previous location; I tried to account for several of these, but the variety of mobility in Garry's Mod is too great for me to fully counter
- Sometimes, Barney's interrogation room door in Station 01 will get stuck; this is a bug caused by the decompile/recompile process, and my main solution is to either noclip through or force it open via other means.
- When you reach the end of a map, a transition is meant to happen. The transitions are as follows;
~ Station 01: You merely transition to the altered version of Station 02, as usual.
~ Station 02, Eli's Lab, and Ravenholm 01: G-Man captures you, but instead of getting booted to the title screen, you get put in transition or stasis, as indicated by on-screen text. (This may not show up if you have disabled your HUD) After which, you should get loaded into the title-screen variant of the map you were on, but sometimes you get booted back to the title screen instead. This is an engine bug, and I cannot fix it.
- If G-Man ends up dying in action (and I should hope you didn't do it on purpose, unless you're going for the achievement) then the screen will go black / static as a message displays on the screen, and shortly thereafter the map will restart. If the text does not appear, then you have likely disabled part of your HUD/UI and should re-enable it. If the map does not restart on its own, then something you have done has prevented this basic engine function from, well, functioning, and you must restart the map yourself. Only you can figure out what's wrong with your installation.

If you experience bugs such as:
- G-Man's movement is not working as intended
- Enemies (other than Headcrabs) attack G-Man
- G-Man seemingly dies at random (read the last paragraph above for reference on what happens)
- Map transitions just don't work at all

Then it's more likely a clientside issue and something you've done has broken these basic Source Engine functions. Please make sure you have not installed any addons that cause these function malformities.